Best seats are Upper Box sections 7-19 (Odd numbered), section 15 is the best!!!
Used to have season tix in section 15 (2007-2010), LOVED IT! All Niner fans who don't sell/give tickets to opposing fans, and no bad drunks (if there are, security really cool near there and will escort them out, so ur kid can have fun). Also, clear view of Jumbotron, Garlic fries right next to section 17, shade around 2:30-3pm, and mens restroom next to section 15 (don't have to walk too far
).
I also had season tix before I got to section 15 in upper reserve 54 (other side of stadium), and I had horrendous experiences there. No view of Jumbotron, sun in your face the entire game, and worst of all most of the visiting fans were there and I got into too many fights. Lots of swearing and lots of food/beer/etc being thrown there, just unpleasant (though, once again, may have changed since I was in that section in 2006)
Tickets around section 15 usually between 64-75 bucks, but dunno how much season tix went up since I left two years ago. Hope this helps
Oh yeah, get the parking pass if u can.